Myself, JB4, silver, kebab, and big-eye just did some testing. We experimented on the streets level and used the Sidewalk squares and squad-leader order to measure distances for grenade splash damage, grenade-launcher splash damage, c4 splash damage, c4 detonator range, emp rocket splash effectiveness range, and drones spotting range. We'll add more as we test more, but in the mean time here's what we found:
Drones


Grenades
Grenade Launcher (Assault Rifle)
C4 (Spec Ops loadout)

EMP (Counter-measures Role)
Anti-Vehicle Rocket
